#include <stdio.h>

void swap(int *x, int *y);

void swap(int *x, int *y)
{
	int temp;

	printf("In swap 互换前：*x = %d,*y = %d\n",*x,*y);

	temp = *x;
	*x = *y;
	*y = temp;	
	
	printf("In swap 互换后：*x = %d,*y = %d\n",*x,*y);
}

int main()
{
	int x = 3, y = 5;
	
	printf("In main 互换前：*x = %d,*y = %d\n",x,y);
	swap(&x,&y);
	printf("In main 互换后：*x = %d,*y = %d\n",x,y);
	
	return 0;	
}
